One vertex per element, one color per generator, with an edge from x to x·s.
(2,5)(3,4)(9,10)(11,16)(12,20)(13,18)(14,15)(17,22)(19,21)(23,24)(25,26,29,30)(27,33,35,31)(28,32,38,36)(34,40,37,39)(1,2,6,5)(3,8,4,7)(10,15)(11,19)(17,20)(18,24)(25,26,29,30)(27,31,35,33)(28,32,38,36)(34,39,37,40)(1,3,6,4)(2,7,5,8)(10,15)(11,19)(17,20)(18,24)(26,30)(31,33)(32,36)(39,40)(1,4,6,3)(2,8,5,7)(9,11,14,19)(10,16,15,21)(12,18,22,24)(13,17,23,20)(25,26)(27,31)(28,36)(29,30)(32,38)(33,35)(34,40)(37,39)(1,5,6,2)(3,8,4,7)(9,12,14,22)(10,17,15,20)(11,18,19,24)(13,16,23,21)(25,27,29,35)(26,31,30,33)(28,37,38,34)(32,40,36,39)(9,13,14,23)(10,18,15,24)(11,20,19,17)(12,21,22,16)(25,28,29,38)(26,32,30,36)(27,34,35,37)(31,39,33,40)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.